<!DOCTYPE html>
<html lang="en">

  <head>
    <meta charset="UTF-8">
    <title>搜索框输入文字自动提示</title>
    <link rel="stylesheet" href="../public/css/bootstrap.min.css">
    <style type="text/css">
      .container {
        padding-top: 150px;
      }
    </style>
  </head>

  <body>
    <div class="container">
      <div class="form-inline">
        <div class="form-group">
          <select class="form-control" id="province"></select>
        </div>
        <div class="form-group">
          <select class="form-control" id="city">
            <option>请选择城市</option>
          </select>
        </div>
        <div class="form-group">
          <select class="form-control" id="area">
            <option>请选择县城</option>
          </select>
        </div>
      </div>
    </div>
    <script src="../js/ajax.js"></script>
    <script src="../js/template-web.js"></script>
    <!-- 省份模板 -->
    <script type="text/html" id="provinceTpl">
      <option>请选择省份</option>
      {{each province}}
      <option value="{{$value.id}}">{{$value.name}}</option>
      {{/each}}
    </script>
    <!-- 城市模板 -->
    <script type="text/html" id="cityTpl">
      <option>请选择城市</option>
      {{each city}}
      <option value="{{$value.id}}">{{$value.name}}</option>
      {{/each}}
    </script>
    <!-- 县城模板 -->
    <script type="text/html" id="areaTpl">
      <option>请选择县城</option>
      {{each area}}
      <option value="{{$value.id}}">{{$value.name}}</option>
      {{/each}}
    </script>
    <script>
      // 获取省市区下拉框元素
      var province = document.getElementById('province');
      var city = document.getElementById('city');
      var area = document.getElementById('area');
      // 获取省份信息
      AJAX({
        type: 'get',
        url: 'http://localhost:3000/province',
        success: function (data) {
          // 将服务器端返回的数据和html进行拼接
          var html = template('provinceTpl', {
            province: data
          });
          // 将拼接好的html字符串显示在页面中
          province.innerHTML = html;
        }
      });

      // 为省份的下拉框添加值改变事件
      province.onchange = function () {
        // 获取省份id
        var pid = this.value;

        // 清空县城下拉框中的数据
        var html = template('areaTpl', {
          area: []
        });
        area.innerHTML = html;

        // 根据省份id获取城市信息
        AJAX({
          type: 'get',
          url: '/cities',
          data: {
            id: pid
          },
          success: function (data) {
            var html = template('cityTpl', {
              city: data
            });
            city.innerHTML = html;
          }
        })
      };

      // 当用户选择城市的时候
      city.onchange = function () {
        // 获取城市id
        var cid = this.value;
        // 根据城市id获取县城信息
        ajax({
          type: 'get',
          url: 'http://localhost:3000/areas',
          data: {
            id: cid
          },
          success: function (data) {
            var html = template('areaTpl', {
              area: data
            });
            area.innerHTML = html;
          }
        })
      }
    </script>
  </body>

</html>